What primary factor influences daily reach estimates?

The primary factor that influences daily reach estimates is closely tied to your bid amount and budget. When setting up a campaign, the budget directly impacts how many people your ads can be shown to within a certain time frame. A higher budget typically allows for a larger audience to be reached, as it provides more resources to deliver ads across various placements.

Additionally, the bid amount plays a crucial role because it determines how competitive your ad is in the auction process. If your bid is too low compared to others targeting similar audiences, your ad may not be shown as often or at all, effectively limiting your reach. Therefore, both your budget and bid strategy are essential components that directly contribute to estimating how many users will see your ads on a daily basis.

While the audience demographics, historical performance, and creative design can influence the effectiveness of your ads, they do not directly affect the maximum reach that can be calculated based on available budget and bidding strategy.